From Semantic Web Technologies

Query Languages

In this chapter, we have a closer look at some important query languages for
RDF and OWL. For RDF, this query language is SPARQL, while for OWL DL
we have to be content with so-called conjunctive queries as a basic formalism
that is not part of a standardized query language yet. We will see that the
latter is also closely related to the kind of rules introduced in Chapter 6.